Apex domains cannot have CNAME records.
Question and response
Question
dig gloriagalery.com. NS
Answer
gloriagalery.com. 5 NS ns-2004.awsdns-58.co.uk.
gloriagalery.com. 5 NS ns-294.awsdns-36.com.
gloriagalery.com. 5 NS ns-742.awsdns-28.net.
gloriagalery.com. 5 NS ns-1937.awsdns-50.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0